So, it proves one thing: your models are wrong.
It has been my theory that the Universe’s expansion is not linear nor equal in all directions.
The closer you get to the Big Bang, the slower it was as we observe it, due to Time Dilation.
As the outer edges of the Universe get farther away from that point, the force of Gravity holding it back gets weaker, so the expansion gets faster or at least appears to be.
Seems rather simple................